I believe I've (finally) nailed the flap drag bug in YASim. A good amount of thought, some work with pencil and paper, and a (IMNSHO) damn clever application of the small angle approximation worked quite well. The code changes were actually very modest and well-contained; no machetes necessary.
I think I also found what might have been causing the weird divergence bug that some people reported (although I haven't succeeded in reproducing it myself). For flaps with very high lift numbers and at very high negative AoA's, it was possible to get the wing to essentially have a negative drag. The aircraft would then get free acceleration, although this should still have been a plausibly small number, and not an explosion. Anyway, it's fixed. If someone sees the divergence happen again, please tell me right away. I test-flew the planes for at least one approach each, but clearly more trials are needed. Grab new code from CVS and new planes from fgfsbase and give your favorite YASim plane a whirl. Andy -- Andrew J. Ross NextBus Information Systems Senior Software Engineer Emeryville, CA [EMAIL PROTECTED] http://www.nextbus.com "Men go crazy in conflagrations. They only get better one by one." - Sting (misquoted) _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
